92 lines
4.2 KiB
Objective-C
92 lines
4.2 KiB
Objective-C
//
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// Created by Gabriel Handford on 3/1/09.
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// Copyright 2009-2013. All rights reserved.
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// Created by John Boiles on 10/20/11.
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// Copyright (c) 2011. All rights reserved
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// Modified by Felix Schulze on 2/11/13.
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// Copyright 2013. All rights reserved.
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//
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// Permission is hereby granted, free of charge, to any person
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// obtaining a copy of this software and associated documentation
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// files (the "Software"), to deal in the Software without
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// restriction, including without limitation the rights to use,
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// copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the
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// Software is furnished to do so, subject to the following
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// conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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// OTHER DEALINGS IN THE SOFTWARE.
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//
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#import "UIImage+Compare.h"
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@implementation UIImage (Compare)
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- (BOOL)compareWithImage:(UIImage *)image
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{
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NSAssert(CGSizeEqualToSize(self.size, image.size), @"Images must be same size.");
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// The images have the equal size, so we could use the smallest amount of bytes because of byte padding
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size_t minBytesPerRow = MIN(CGImageGetBytesPerRow(self.CGImage), CGImageGetBytesPerRow(image.CGImage));
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size_t referenceImageSizeBytes = CGImageGetHeight(self.CGImage) * minBytesPerRow;
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void *referenceImagePixels = calloc(1, referenceImageSizeBytes);
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void *imagePixels = calloc(1, referenceImageSizeBytes);
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if (!referenceImagePixels || !imagePixels) {
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free(referenceImagePixels);
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free(imagePixels);
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return NO;
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}
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CGContextRef referenceImageContext = CGBitmapContextCreate(referenceImagePixels,
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CGImageGetWidth(self.CGImage),
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CGImageGetHeight(self.CGImage),
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CGImageGetBitsPerComponent(self.CGImage),
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minBytesPerRow,
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CGImageGetColorSpace(self.CGImage),
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(CGBitmapInfo)kCGImageAlphaPremultipliedLast
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);
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CGContextRef imageContext = CGBitmapContextCreate(imagePixels,
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CGImageGetWidth(image.CGImage),
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CGImageGetHeight(image.CGImage),
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CGImageGetBitsPerComponent(image.CGImage),
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minBytesPerRow,
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CGImageGetColorSpace(image.CGImage),
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(CGBitmapInfo)kCGImageAlphaPremultipliedLast
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);
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CGFloat scaleFactor = [UIScreen mainScreen].scale;
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CGContextScaleCTM(referenceImageContext, scaleFactor, scaleFactor);
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CGContextScaleCTM(imageContext, scaleFactor, scaleFactor);
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if (!referenceImageContext || !imageContext) {
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CGContextRelease(referenceImageContext);
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CGContextRelease(imageContext);
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free(referenceImagePixels);
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free(imagePixels);
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return NO;
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}
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CGContextDrawImage(referenceImageContext, CGRectMake(0.0f, 0.0f, self.size.width, self.size.height), self.CGImage);
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CGContextDrawImage(imageContext, CGRectMake(0.0f, 0.0f, image.size.width, image.size.height), image.CGImage);
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CGContextRelease(referenceImageContext);
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CGContextRelease(imageContext);
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BOOL imageEqual = (memcmp(referenceImagePixels, imagePixels, referenceImageSizeBytes) == 0);
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free(referenceImagePixels);
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free(imagePixels);
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return imageEqual;
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}
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@end
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